Rapid Removal and Mineralization of Bisphenol A by Heterosupramolecular Plasmonic Photocatalyst Consisting of Gold Nanoparticle-Loaded Titanium(IV) Oxide and Surfactant Admicelle

Abstract

The establishment of technology for rapid and complete removal and mineralization of harmful phenolic compounds from water is of great importance for environmental conservation. Visible-light irradiation (λ > 430 nm, light intensity integrated from 420 to 485 nm = 6.0 mW cm) of Au nanoparticle (NP)-loaded TiO (Au/TiO) in dilute aqueous solutions of bisphenol A (BPA) and p-cresol (PC) causes degradation of the phenols. The addition of trimethylstearylammonium chloride (CTAC) enhances the adsorption of BPA on Au/TiO to greatly increase the rate of reaction. Consequently, 10 μM phenols are completely removed from the solutions within 2.5 h irradiation, and prolonging irradiation time to 24 h quantitatively oxidizes BPA to CO. Dynamic light scattering ζ-potential measurements indicate that a CTAC bilayer or admicelle is formed on the Au/TiO particle surface at CTAC concentration >50 μM. The action spectrum for reaction shows that this reaction is driven by the Au NP localized surface plasmon resonance excitation-induced interfacial electron transfer from Au to TiO. We propose a possible reaction scheme on the basis of the experimental results including intermediate analysis.

Photoreactive Carbon Dots Modified g-C3N4 for Effective Photooxidation of Bisphenol-A under Visible Light Irradiation

“…Further, hydroxylation of mono-hydroxylated BPA formed dihydroxylated BPA (m/z 259) [63]. The 4-isopropenylphenol was further oxidized to easily decomposable 4-hydroxyacetophenone (m/z 136) and 4-(2-hydroxyprop-2-yl)phenol [64][65][66][67][68]. The aromatic compounds were broken down into simple organic acids (maleic acid, glycolic acid, and acetic acid) at the end of the process, which became transformed into CO…”

Hyper-Cross-linked Porous MoS2–Cyclodextrin-Polymer Frameworks: Durable Removal of Aromatic Phenolic Micropollutant from Water

“…Additionally, BPA is hardly degraded and easy bioaccumulates, making it urgent and important to develop a sustainable, effective, and economical removal method. Various technologies have been examined for BPA removal, such as Gram-negative aerobic bacterium degradation, photocatalytical oxidation, enzyme-catalyzed reaction, oxidative removal, adsorption method, etc. − In addition, an emerging water-purification technique, such as solar-driven steam generation, also certainly works for BPA-polluted water. − Especially, the adsorption methods are most widespread due to their cost-effectiveness, ease of operation, and potential reusability. Nevertheless, the performance of removing BPA by adsorption method has been limited because of the low concentration of BPA in water sources and the associated difficulties in analysis.…”